说明：  针对NTC热敏电阻阻值与温度（R－T）的非线性特性，为了提高测温精度，提出一种三 阶对数公式法对R－T特性进行分段曲线拟合。该测温系统以三阶对数公式为基础进行了软 硬件设计，实现了对船用柴油机的机油温度、冷却水温度的高精度测量
(Since the NTC thermistor＇s resistance and temperature（R－T） there is a serious non－linear characteristics， in order to improve the temperature measurement accuracy，design idea about the third－order natural logarithm formula method was put forward which was used for piecewise curve－fitting of R－T’s characteristics．)